十字形截面方钢管混凝土组合异形柱轴压承载力试验

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简要：在钢筋混凝土异形柱和异形钢管混凝土柱的基础上，提出了一种异形柱形式一十字形裁面方钢管混凝
土组合异形柱，通过理论计算和有限元分析得到了异形柱的破坏形态及极限承栽力，并采用叠加理论推导了其换
算长细比计算公式，通过抽压试验得到了计算模型的荷栽位移曲线、单肢浇度曲线以及单肢荷戴应变南线，分析结
果可知，叠加理论计算、有限元分析以及袖压试验的结果一致袁明异形柱的破环形态为扭转屈曲，可时3种方法得
到的属服荷戴吻合较好，敢证了采用叠加理论计算异形柱承栽力的可行性
关键词：十字形；混凝土方钢管：组合异形柱：叠加理论：轴压试验
中图分类号：TU241；TU271
文献标志码：A
文章编号：0493-2137(2006)11-1275-08
Experiment of Axial Compression Bearing Capacity
for Crisscross Section Special-Shaped Column
Composed of Concrete-Filled Square Steel Tubes
CHEN Zhi-hua,LI Zhen-yu,RONG Bin,LIU Xi-liang
(School of Civil Engineering,Tianjin University,Tianjin 300072,China)
Abstract:Based on the reinforced concrete-filled special-shaped column and the concrete-filled column com-
posed of special-shaped steel tubes,a type of special-shaped column,crisscross section column composed of
concrete-filled square steel tubes,is proposed.Study on calculation method and mechanical property of crisscross
section column composed of concrete-filled square steel tubes is done by three methods:superposition theory,fi-
nite element analysis and axial compression experiment.The failure mode and ultimate bearing capacity are a-
chieved by theoretical calculation and finite element analysis.And the formula for conversion slenderness ratio is
derived by superposition theory.By axial compression experiment,the curves of load-displacement for the whole
member,the curves of deflection and load-strain for mono column are got.The results of theoretical calculation,
finite element analysis and axial compression experiment all show that the column has a twist failure mode.Also
the yielding loads attained by the three methods accord with each other well,and the feasibility of calculating the
bearing capacity of the special-shaped column by superposition theory is proved.
Keywords:crisscross section;concrete-filled square steel tube;special-shaped composed column;superposi-
tion theory;axial compression experiment
异形柱最突出的特点是只有灵活的截面形式，目
3种截面形式.近年，各地通过深人研究并结合实际工
前，对于异形柱的研究，主要集中于钢筋混凝土异形柱
程应用，已相继编制出地方标准供设计人员采用，如天
和异形钢管混凝土柱2种类型.其中钢筋混凝土异形
津市《大开间住宅钢筋混凝土异形柱框轻结构技术规
柱的研究和应用最为广泛，主要有L形、T形和十字形
程》(DB29-16-2003)[1.